PEC Plus user manual Connecting equipment to your PEC Plus
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Feedback potentiometers
Each actuator you connect must have a feedback potentiometer. The feedback potentiometer, which
you connect to one of your PEC Plus’ two corresponding feedback terminals, lets the control know
how far the actuator’s arm is extended.
Most linear actuators are available with potentiometer feedback and internal adjustable limit
switches. A 10,000 ohm, 10 turn feedback potentiometer is preferred, but the internal feedback
potentiometer can range between 1000 and 20,000 ohms. Potentiometers outside of this range will
affect the precision to which your PEC Plus can control the actuator.
If your actuator does not have a feedback potentiometer, Phason offers an Actuator
Position Sensor (APS-1). For more information, contact Phason or your distributor.
A system operates more precisely when using the largest amount of stroke that is
feasible with the actuator. The stroke is the distance the actuator arm extends or
retracts.
Actuator present pins
The actuator present pins are for calibrating the actuators. For more information, read Calibrating
actuators
on page 35.
Each actuator requires two relays: one for extending the actuator arm (opening the inlet), and one
for retracting the arm (closing the inlet).
Actuator 1 (ACT1) uses relay 1 to open (extend) the actuator and relay 2 to close (retract) the
actuator.
Actuator 2 (ACT2) uses relay 3 to open and relay 4 to close the actuator.
The ratings of the actuator must not exceed the ratings of the PEC Plus.
PEC Plus relay ratings: 10 A at 120/230 VAC, general-purpose (resistive)
1/3 HP at 120 VAC, 1/2 HP at 230 VAC
360 W tungsten at 120 VAC
Refer to
Appendix D: Installation worksheet on page 84 when installing actuators.
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